Learn Mathematics & Basic Tools — Calculator Tutorials & Guides
20 step-by-step guides for mathematics & basic tools. Master calculation methods with detailed examples and practical tips.
How to Use a Basic Calculator - Step-by-Step Guide
Master add, subtract, multiply and divide on a basic calculator with memory keys, order of operations and examples.
How to Use a Scientific Calculator - Trig & Logs
Master trig, logs, exponents, angle modes and memory/history. Clear steps with practical examples.
How to Plot Functions - Cartesian, Parametric & Polar
Graph functions online: Cartesian, parametric and polar. Learn window/scale selection with worked examples.
How to Use Fractions - Operations & Simplifying
Add, subtract, multiply, divide and simplify fractions. Includes mixed numbers and decimal conversion steps.
How to Calculate Percentages - % Of & % Change
Learn % of, % change and % difference with clear formulas and worked examples you can reuse anywhere.
How to Simplify and Use Ratios - Scaling, Proportions & Examples
Learn how to simplify ratios, scale them up or down, solve proportions, and convert ratios to fractions or percentages with clear, step-by-step examples.
How to Test Primes & Factorise - Methods & Tips
Check primality, build factor trees and generate primes. Learn the sieve of Eratosthenes with examples.
How to Multiply, Invert & Solve with Matrices
Matrix multiplication, determinant, inverse and solving Ax=b explained with clear, worked examples.
How to Solve Linear & Quadratic Equations
Learn substitution, factoring, quadratic formula and elimination with step-by-step worked examples.
How to Calculate Age Accurately: A Complete Manual Guide
Learn how to calculate age from a date of birth manually. Step-by-step guide with formulas, examples, and how to account for leap years and variable month lengths.
How to Calculate Days Between Dates & Add Days
Work out durations and add/subtract days, including business days. Date maths tips with examples.
Tip Calculator – Calculate Tips & Split Bills Fairly
Easily calculate tips and split bills with our tip calculator. Adjust for tax, service charge, and group size for fair gratuity worldwide.
How to Convert Units - Metric & Imperial Guide
Master unit conversions for length, mass, temperature and volume with worked examples and prefix tips.
How to Calculate Area - Formulas & Examples
Area formulas for circles, rectangles, triangles and more with step-by-step examples and unit guidance.
How to Calculate Volume - Shapes & Worked Steps
Compute volume for cylinders, spheres, prisms and tanks. Worked examples, units and conversion tips.
How to Use Significant Figures - Rules & Rounding
Count and round significant figures correctly. Apply rules in addition, subtraction, multiplication and division.
How to Convert Roman Numerals - Rules & Examples
Convert between Roman numerals and numbers. Learn subtractive notation rules with clear, worked examples.
How to Convert Binary - Decimal, Hex & Octal
Learn binary conversion to decimal, hex and octal using bit weights and examples, plus two’s complement basics.
How to Add, Subtract & Convert Time
Add/subtract durations, find differences and convert to decimal hours. Ideal for timesheets and payroll.
How to Calculate Speed, Distance & Time
Use the speed formula to solve for distance or time with unit conversions and practical travel examples.